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Sagot :
Answer:
y=120
z=20
Step-by-step explanation:
angle below y is 60° because of corresponding angles
y=180-60=120
y+(4z-20)=180(angles in a straight line)
120+4z-20=180
100+4z=180
4z=180-100
4z=80
z=80/4
z=20°
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